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<pre><span class="sourceLineNo">001</span>package org.teapot.db.orm.mdl;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.util.ArrayList;<a name="line.3"></a>
<span class="sourceLineNo">004</span><a name="line.4"></a>
<span class="sourceLineNo">005</span>/**<a name="line.5"></a>
<span class="sourceLineNo">006</span> * field list.<a name="line.6"></a>
<span class="sourceLineNo">007</span> * @author DBJ<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> */<a name="line.9"></a>
<span class="sourceLineNo">010</span>public class Columns implements IClause {<a name="line.10"></a>
<span class="sourceLineNo">011</span>  public static final int ALL = 1;<a name="line.11"></a>
<span class="sourceLineNo">012</span>  public static final int DISTINCT = 2;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>  private int opt = Columns.ALL;<a name="line.14"></a>
<span class="sourceLineNo">015</span>  private ArrayList&lt;Column&gt; columns = new ArrayList&lt;Column&gt;();<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>  public Columns() {<a name="line.17"></a>
<span class="sourceLineNo">018</span>    this(Columns.ALL);<a name="line.18"></a>
<span class="sourceLineNo">019</span>  }<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>  /**<a name="line.21"></a>
<span class="sourceLineNo">022</span>   *  Columns.<a name="line.22"></a>
<span class="sourceLineNo">023</span>   * @param option 选项。<a name="line.23"></a>
<span class="sourceLineNo">024</span>   */<a name="line.24"></a>
<span class="sourceLineNo">025</span>  public Columns(int option) {<a name="line.25"></a>
<span class="sourceLineNo">026</span>    if (option &lt; 1 || option &gt; 2) {<a name="line.26"></a>
<span class="sourceLineNo">027</span>      opt = Columns.ALL;<a name="line.27"></a>
<span class="sourceLineNo">028</span>    } else {<a name="line.28"></a>
<span class="sourceLineNo">029</span>      opt = option;<a name="line.29"></a>
<span class="sourceLineNo">030</span>    }<a name="line.30"></a>
<span class="sourceLineNo">031</span>  }<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>  /**<a name="line.33"></a>
<span class="sourceLineNo">034</span>   * getColumns.<a name="line.34"></a>
<span class="sourceLineNo">035</span>   * @return 字段<a name="line.35"></a>
<span class="sourceLineNo">036</span>   */<a name="line.36"></a>
<span class="sourceLineNo">037</span>  public String getColumns() {<a name="line.37"></a>
<span class="sourceLineNo">038</span>    StringBuffer buf = new StringBuffer();<a name="line.38"></a>
<span class="sourceLineNo">039</span>    buf.append(this.opt == Columns.DISTINCT ? " DISTINCT " : " ALL ");<a name="line.39"></a>
<span class="sourceLineNo">040</span>    int max  = this.columns.size();<a name="line.40"></a>
<span class="sourceLineNo">041</span>    if (max == 0) {<a name="line.41"></a>
<span class="sourceLineNo">042</span>      buf.append(" * ");<a name="line.42"></a>
<span class="sourceLineNo">043</span>    }<a name="line.43"></a>
<span class="sourceLineNo">044</span>    for (int idx = 0; idx &lt; max; ) {<a name="line.44"></a>
<span class="sourceLineNo">045</span>      buf.append(this.columns.get(idx));<a name="line.45"></a>
<span class="sourceLineNo">046</span>      idx ++;<a name="line.46"></a>
<span class="sourceLineNo">047</span>      if (idx &lt; max) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>        buf.append(", ");<a name="line.48"></a>
<span class="sourceLineNo">049</span>      }<a name="line.49"></a>
<span class="sourceLineNo">050</span>    }<a name="line.50"></a>
<span class="sourceLineNo">051</span>    return buf.toString();<a name="line.51"></a>
<span class="sourceLineNo">052</span>  }<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>  public Columns add(String col) {<a name="line.54"></a>
<span class="sourceLineNo">055</span>    this.columns.add(new Column(col));<a name="line.55"></a>
<span class="sourceLineNo">056</span>    return this;<a name="line.56"></a>
<span class="sourceLineNo">057</span>  }<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>  public Columns add(String col, String ali) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>    this.columns.add(new Column(col, ali));<a name="line.60"></a>
<span class="sourceLineNo">061</span>    return this;<a name="line.61"></a>
<span class="sourceLineNo">062</span>  }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  /**<a name="line.64"></a>
<span class="sourceLineNo">065</span>   * @see java.lang.Object#toString()<a name="line.65"></a>
<span class="sourceLineNo">066</span>   */<a name="line.66"></a>
<span class="sourceLineNo">067</span>  @Override<a name="line.67"></a>
<span class="sourceLineNo">068</span>  public String toString() {<a name="line.68"></a>
<span class="sourceLineNo">069</span>    return this.getColumns();<a name="line.69"></a>
<span class="sourceLineNo">070</span>  }<a name="line.70"></a>
<span class="sourceLineNo">071</span>}<a name="line.71"></a>




























































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